I can add a custom title.
I think the market for turn-based tactical gameplay is pretty high. The most recent games I can think of are the latest version of the X-Com games. 4-6 soldiers in skirmish battles. 4e would easily work similar to these games, I wouldn't try to emulate the old 3e or 2e style DnD games, rather I'd make it a game that uses 4e and the 4e systems. It believe it would work perfectly for this style of game.Nope, never heard of them. Not surprising, I'm not really huge into video games, and was never into console games.
But, I think my point is, if you have to dredge back 25 years to find an example of how 4e would look as a video game, then, well, it probably wouldn't make a very good video game. Like I said, 3e works so much better. Baldur's Gate, Neverwinter Nights, that Eberron MMO that they had. Those style mechanics work fantastic for a video game.
I mean, good grief, how hard would it be to make a 3e style Elder Scrolls game?